Web Technology Blog by Gion Kunz

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The web is full of resources telling you to use the relative lengths “em” and “rem” over pixel, because they would make your design more accessible. Almost all Front-End Developers I know (including myself) were blindly following these instructions for years and it became a de facto standard in the industry. I’ve done some research lately that completely changed my mind about these two relative units. I won’t use “rem” going forward and only use “em” in very specific use-cases. In this article I’m going to share my observations and hopefully convince you to put an end to our beloved “rem” unit, that finally made it into our tools without fall backs (given IE8 dying slowly), but became totally useless in favour of the more popular CSS reference pixel.